Adjustable head for scratch



(N0 Medel.)

G'. H. TANSLEY.

ADJUSTABLE HEAD EOE SCRATCH, SURFACE, OR OTHER GAGES. I No. 438,738.Patented 0011.21, 1890.

lhmwk f UNITED STATES PATENT OFFICE.

GEORGE H. TANSLEY, OF HARTFORD, CONNECTICUT.

ADJUSTABLE HEAD FOR SCRATCH, SURFACE, OR OTHER GAGES.

SPECIFICATION forming part of Letters Patent No. 438,738, dated October21, 1890.

Application filed March 31, 1888. Serial No. 269,106. (No model.)

To all whom it mag/concern.-

Be it known that I, GEORGE H. TANSLEY, of Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Adjustable Heads for Scratch, Surface, or other Gages,of which the following is a full, clear, and exact description, wherebyany one skilled in the art can make and use the same.

The object of my invention is to provide a movable head that shall bereadily movable along a bar or standard, and yet capable of fineadjustment or of being held securely at any point along the limit of itsplay, the said head with its attachment being specially adapted for useon various classes of gages in common use by mechanics. 1 To this end myimprovement consists in the combination of a standard or bar with asleeve having a sliding play on the bar and threaded on the outside witha head, checknut, and clamp-nut borne on the threaded sleeve; anditfurther consists in details of the bar, the threaded sleeve, and theclampin g devices, as more particularly hereinafter described, andpointed out in the claims.

Referring to the drawings, Figure 1 is a side view of, the scratch-gage.Fig. 2 is a View of the same with parts of the head cut away in centralsection to show the construction. Fig. 3 is a detail view of amicrometergage embodying my improvement. Fig. 4 is a detail view of asurface-gage, also embodying my improvement.

In the accompanying drawings, the letter a denotes a rod or standardthat may be of any desirable material, preferably of metal, and

of any convenient outline in cross-section, although preferably round.

The letter Z) denotes the threaded sleeve that fits closely upon the bara and is adapted to slide freely lengthwise thereof. This sleeve has anexterior thread, and at one end has a slot 1), the clamp-nut 0 beingfitted upon the thread at this end, that is preferably tapered, so thatby means of the nut the sleeve may be clamped upon the bar a and heldagainst any sliding movement thereon. On this threaded sleeve is alsoborne a head d of any convenient form, depending upon the style of gageon which it is tobe used.

In the scratch-gage shown in Figs. 1 and 2 the head has a centralopening and fits quite closely about the rod a for a part of its length,and is counterbored and threaded to enable it to fit upon the sleeve forthe rest of its length. Back of the head is located a checknut e, thefunction of this check-nut being to hold the head against rotation afterit has been set at the desired distance from the scratch f. For thecloser adjustment of the bearing-surface (1 of the head with relation tothe scratch f, the clamp-nut is loosened and the sleeve slid along untilthe head is approximately located. The clamp-nut c is then used toprevent further movement of the sleeve along the rod, and the head d isrotated until the exact adjustment is obtained, and it is then held insuch adjust ment by means of the check-nut e. The bar a may be graduatedin the usual manner, and such graduations serve as a means of settingthe head at any desired distance from the scratch f.

In the form of gage shown in Fig. 3 the head (1 is the movable head of amicrometergage, the sleeve 1) having a sliding movement upon the bar,carrying with it the head, except when held in place by means of aclampnut, as in the form already described.

In the form of my invention shown in Fig. at my improvement is adaptedfor use in a surface-gage, the head (1 being supported on the sleeve 29,which is of substantially the same construction and arrangement as toits feed-nut, clamp, and check-nut as in the devices already described.The usual features of a device for measurement of length may be added tothe several forms of my improved device herein shown, so thatmeasurements may be made and exact adjustments secured.

Instead of the form of clamping-nut fitted upon the tapered end of thesleeve, as shown in Figs. 1, 2, and 4 of the drawings, I prefer to use anut like that shown in Fig. 3, the nut having at the end of the threadon its inner side a sloping shoulder that by contact with the beveledend of the sleeve tends to clamp the sleeve upon the bar. The sleeve, inthe use of such a nut, is not tapered onthe outside where the thread iscut. In the form of gage-shown in the same figure (3) one of the jaws isprovided with an adjustable screwplug, the head of the plug forming thecontact surface of the jaw.

I claim as my invention- In a gage, in combination with a bar orstandard a, a threaded sleeve movable lengthwise of said bar andcompressible at one end upon the bar, an adjustable head borne on thethreaded sleeve, a clamp-nut also borne on the sleeve and adapted tocompress the same upon 10 the bar, and a cheek-nut adjacent to themovable head and located on the threaded sleeve.

all substantially as described.

GEORGE I-I. TANSLEY.

\Vitnesses:

CHAS. L. BURDETT, VVILBUR H. HALLIDAY.

